Development of a Compact, Seal-Less, Tripod-Supported Centrifugal Blood Pump

Ouchi, K.; Yuhki, A; Nakamura, Morimasa; Sakamoto, Tohru; Takatani, Setsuo

doi:10.1201/b14731-50

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…The pump can provide flows of 4 to 5 L/min against the 100 mm Hg head pressure at 2,000 rpm. Compared with the head pressure‐flow curves of the tripod supported centrifugal pump previously reported (6,7), pump efficiency was roughly twice due to reduction in the friction loss at the pivot bearing. Optimization in the coupling distance between the driver and follower magnets and selection of the permanent magnet materials should improve pump performance by reducing the friction loss at the pivot bearing and hence the required power.…”

Section: Discussionmentioning

confidence: 70%

“…To meet this need, previously we reported the concept and performance of a tripod supported, sealless, ultracompact centrifugal blood pump that was originally proposed by Nosé and Ohara (5). The hydrodynamic characteristics of the tripod supported centrifugal blood pump showed acceptable performance as a left and/or right ventricular support device (6–8). However, the effect of the friction between the tripod and polyethylene groove was shown not to be suitable for long‐term use.…”

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confidence: 99%

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Design and Evaluation of a Single‐Pivot Supported Centrifugal Blood Pump

et al. 2001

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In order to develop a centrifugal blood pump that meets the requirements of a long-term, implantable circulatory support device, in this study a single-pivot bearing supported centrifugal blood pump was designed to evaluate its basic performance. The single-pivot structure consisted of a ceramic ball male pivot mounted on the bottom surface of the impeller and a polyethylene female pivot incorporated in the bottom pump casing. The follower magnet mounted inside the impeller was magnetically coupled to the driver magnet mounted on the shaft of the direct current brushless motor. As the motor rotated, the impeller rotated supported entirely by a single-pivot bearing system. The static pump performance obtained in the mock circulatory loop revealed an acceptable performance as a left ventricular assist device in terms of flow and head pressure. The pump flow of 5 L/min against the head pressure of 100 mm Hg was obtained at rotational speeds of 2,000 to 2,200 rpm. The maximum pump flow was 9 L/min with 2,200 rpm. The maximum electrical-to-hydraulic power conversion efficiency was around 14% at pump flows of 4 to 5 L/min. The stability of the impeller was demonstrated at the pump rpm higher than 1,400 with a single-pivot bearing without an additional support at its top. The single-pivot supported centrifugal pump can provide adequate flow and pressure as a ventricular assist device, but its mechanical stability and hemolytic as well as thrombotic performances must be tested prior to clinical use.

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Section: Discussionmentioning

confidence: 70%

mentioning

confidence: 99%

Design and Evaluation of a Single‐Pivot Supported Centrifugal Blood Pump

et al. 2001

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“…The impeller‐rotor assembly was constructed by mounting a vane structure manufactured separately (15–17) on the top of the donut‐shaped bottom rotor casing that contained a follower magnet ring and a MagLev target ring assembly. A washout hole was made at the center of the impeller rotor to create a secondary flow path inside the pump head and was evaluated by flow visualization technique (16,18).…”

Section: Methodsmentioning

confidence: 99%

Disposable Magnetically Levitated Centrifugal Blood Pump: Design and In Vitro Performance

et al. 2005

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A magnetically levitated (MagLev) centrifugal blood pump (CBP) with a disposable pump head has been designed to realize a safe, easy-to-handle, reliable, and low-cost extracorporeal blood pump system. It consisted of a radial magnetic-coupled driver with a magnetic bearing having a two-degree freedom control and a disposable pump head unit with a priming volume of 24 mL. The easy on-off disposable pump head unit was made into a three-piece system consisting of the top and bottom housings, and the impeller-rotor assembly. The size and weight of the disposable pump unit were 75 mm x 45 mm and 100 g, respectively. Because the structure of the pump head unit is easily attachable and removable, the gap between the electromagnets of the stator and the target material in the rotor increased to 1.8 mm in comparison to the original integrated bearing system of 1.0 mm. The pump performance, power requirements, and controllability of the magnetic bearing revealed that from 1400 to 2400 rpm, the pump performance remained fairly unchanged. The amplitudes of the X- and Y-axis rotor oscillation increased to +/- 24 microm. The axial displacement of the rotor, 0.4 mm, toward the top housing was also observed at the pump rpm between 1400 and 2400. The axial and rotational stiffness of the bearing were 15.9 N/mm and 4.4 Nm/rad, respectively. The MagLev power was within 0.7 Watts. This study demonstrated the feasibility of a disposable, magnetically suspended CBP as the safe, reliable, easy-to-handle, low-cost extracorporeal circulation support device.

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Development of a Compact, Seal-Less, Tripod-Supported Centrifugal Blood Pump

Cited by 2 publications

References 2 publications

Design and Evaluation of a Single‐Pivot Supported Centrifugal Blood Pump

Design and Evaluation of a Single‐Pivot Supported Centrifugal Blood Pump

Disposable Magnetically Levitated Centrifugal Blood Pump: Design and In Vitro Performance

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